J/A+A/649/A25 (Possible spiral in the disk around HD34282 (de Boer+, 2021)
Possible single-armed spiral in the protoplanetary disk around HD 34282.
de Boer J., Ginski C., Chauvin G., Menard F., Benisty M., Dominik C.,
Maaskant K., Girard J.H., van der Plas G., Garufi A., Perrot C., Stolker T.,
Avenhaus H., Bohn A., Delboulbe A., Jaquet M., Buey T., Moeller-Nilsson O.,
Pragt J., Fusco T.
<Astron. Astrophys. 649, A25 (2021)>
=2021A&A...649A..25D 2021A&A...649A..25D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, pre-main sequence ; Polarization
Keywords: protoplanetary disks - planet-disk interactions -
planets and satellites: formation - circumstellar matter -
stars: pre-main sequence - polarization
Abstract:
During the evolution of protoplanetary disks into planetary systems we
expect to detect signatures that trace mechanisms such as planet-disk
interaction. Protoplanetary disks display a large variety of
structures in recently published high-spatial resolution images.
However, the three-dimensional morphology of these disks is often
difficult to infer from the two-dimensional projected images we
observe.
We aim to detect signatures of planet-disk interaction by studying the
scattering surface of the protoplanetary disk around HD34282 We
spatially resolved the disk using the high-contrast imager VLT/SPHERE
in polarimetric imaging mode. We retrieved a profile for the height of
the scattering surface to create a height-corrected deprojection,
which simulates a face-on orientation.
The detected disk displays a complex scattering surface. An inner
clearing or cavity extending up to r<0.28" (88au) is surrounded by a
bright inclined (i=56°) ring with a position angle of 119°.
The center of this ring is offset from the star along the minor axis
with 0.07", which can be explained with a disk height of 26au above
the midplane. Outside this ring, beyond its southeastern ansa we
detect an azimuthal asymmetry or blob at r∼0.4". At larger separation,
we detect an outer disk structure that can be fitted with an ellipse,
which is compatible with a circular ring seen at r=0.62" (=190au) and
a height of 77au. After applying a height-corrected deprojection we
see a circular ring centered on the star at 88 au; what had seemed to
be a separate blob and outer ring could now both be part of a
single-armed spiral.
We present the first scattered-light image of the disk around HD 34282
and resolve a disk with an inner cavity up to r∼90au and a highly
structured scattering surface of an inclined disk at a large height
Hscat/r=0.29" above the midplane at the inner edge of the outer
disk. Based on the current data it is not possible to conclude
decisively whether Hscat/r remains constant or whether the surface
is flared with at most Hscat ∝ r1.35, although we favor
the constant ratio based on our deprojections. The height-corrected
deprojection allows for a more detailed interpretation of the observed
structures, from which we discern the first detection of a
single-armed spiral in a protoplanetary disk.
Description:
Fits images corresponding to the imagery presented in the paper. The
data are obtained with VLT/SPHERE/IRDIS. The data reduction is
performed with he latest version of the publicly available IRDAP
pipeline.
Objects:
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RA (2000) DE Designation(s)
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05 16 00.48 -09 48 35.4 HD 34282 = V* V1366 Ori
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 89 2 List of fits images
fits/* . 2 Individual fits images
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 8 F8.5 deg RAdeg Right Ascension of center (J2000)
9- 16 F8.5 deg DEdeg Declination of center (J2000)
18- 21 I4 --- Nx Number of pixels along X-axis
23- 26 I4 --- Ny Number of pixels along Y-axis
28- 31 I4 Kibyte size Size of FITS file
33- 41 A9 --- FileName Name of FITS file, in subdirectory fits
43- 89 A47 --- Title Title of the FITS file
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Acknowledgements:
Christian Ginski, c.ginski(at)uva.nl
(End) Patricia Vannier [CDS] 26-Apr-2021